<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<table border="1">
  <caption>用户列表</caption>
  <tr>
    <th>用户名</th>
    <th>密码</th>
    <th>昵称</th>
  </tr>
</table>
<script>
  let arr =[{username:"小明",password:123456,nickname:"Jack"},
            {username:"小王",password:334455,nickname:"Demo"},
            {username:"小平",password:889976,nickname:"Mick"}];
  let table = document.querySelector("table");
  //遍历数组
  for(let user of arr ){
    let tr = document.createElement("tr");
    let usernameTd = document.createElement("td");
    let passwordTd = document.createElement("td");
    let nicknameTd = document.createElement("td");
    usernameTd.innerText = user.username;
    passwordTd.innerText = user.password;
    nicknameTd.innerText = user.nickname;
    tr.append(usernameTd,passwordTd,nicknameTd);
    table.append(tr);
  }

</script>
</body>
</html>